wake yourself up on timeWhat's the point of this question? What's wrong with the simplest solution? Are you looking for a method that meets your particular criteria (what are they?), or just a laundry list of all possible methods, no matter how impractical?

Does fluctuating sleep habits decrease productivity?Is there really evidence that sleeping less than 8 hours some days is likely to lead to ADD? Could you include a link? This sounds pretty surprising, and would probably cause a lot of people to change their sleep habits if it was widely known.